Muffler



Nov. 3, 1931. c. P. BROCKWAY 1,829,977

MUFFLER Original Filed July 27, 1921 2 SheeQs-Sheet l INVENTOR C'A/PL BADGE/(WA y ATr'bRNEY Nov. 3, 1931. c. P. BROCKWAY 1,829,977

MUFFLER 2 Sheets-Sheet 2 Original Filed July 27, 1921 INVENTOR (145 4 fifiOC/(WA y ATTORNE Patented Nov. 3, 1931 UNITED STATES PATENT OFFICE CARL P. BBOCKWAY, F PATERSON, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE TILLOTSON MANUFACTURING COMPANY, OF TOLEDO, OHIO, A CORPORATION OF DELAWARE MUFFLER Original application filed July 27, 1921, Serial No. 487,974. Divided and this application filed March 17,

, 1927. Serial No. 176,261. 7

This invention relates to internal combus tion engines, and more particularly to a mufiler adapted to be used in conjunction therewith and is a divisional application of my prior application entitled, Two cycle rotary plant, Serial Number 487,974, filed July 27, 1921.

One of the objects of the invention is to provide a muflier having internal absorbing fins and external radiating fins; another object is to provide a mufiler with heat absorbing fins adapted to form expansion chambers one with the other.

Further objects and objects relating to economies of manufacture and details of construction will become apparent as the description of the invention proceeds.

A preferred embodiment of the invention is illustrated in the accompanying drawings wherein Figure I is a vertical section of a combined rotary engine and dynamo unit with the im proved muflier connected thereto, taken through the shafting; and Figure-- II is a section through the engine along lines IIII of Figure I;

Referring to Figure I the combined power unit is shown as including a rotary engine 10 and a dynamo electric machine 11' both of which areinterconnected and in axial alignment; the engine having support through the stationary crank shaft 12, bearing 13, standard 14, and the dynamo having support through the bearing 14, and standard 15 upon the common base 16.

The engine is rotatably mounted through the bushing 17 upon the stationary crank shaft 12 which extends into the crank case 18 of the engine. The crank shaft carries on the crank end the crank arm 19 to which, by means of the screw 20, the roller bearing 21 of the connecting rod head 22 is attached.

The connecting rod 23 is rotatably mounted on the wrist pin 24 which pin has a pivoted bearing in the skirt 25 of the piston 26 so that rotation of the engine about the fixed crank shaft bearing will, by reason of the oifset crank arm pivot 21, cause reciprocation of thepiston in the explosion chamber 27.

' The engine is of the two cycle type and has an intake passage 28 which communicates with an inlet port 29 in the crank case so positioned that when the piston is in its upper position the port is exposed to the crank case interior permitting inflow of fuel gases. A conduit 30 is formed in the cylinder wall 31 having a lower and upper outlet so positioned that when the piston is in its lowermost position the lower outlet registers with the port 32 cut in the piston skirt 25 and the upper outlet opens into the explosion chamber 27 above the piston head 33. It is apparent therefore, that when the piston is in. its lowermost position unburned gas is entering the explosion chamber from the crank case through conduit 30. A deflector 34 of con ventional design is utilized to give the incoming gas an upward movement.

The outlet or exhaust ports 35 are so placed in the engine wall that when the piston is at its lowermost position the ports are com pletely uncovered as indicated in Fig. I. A pipe 36 conducts the expelled gases to the mufiier 37 which-will now be described.

a The mufiler 37 is designed to form acounter weight for the engine. cylinder 31 and inclosed piston 26. For this purpose the muflier cylinder 38 is formed as an extension of the engine crank case 18 and is positioned on the side of the engine axis opposite the engine member. The mufller has a mass approaching in value that of the engine member and includes in addition'to the cylindrical wall 38, a head 39 to which is integrally secured an inwardly projecting central post 40 having outwardly and laterally extending parti tion plates 41 fixed thereto at approximately regular intervals. An outwardly projecting plate42 extends from the closed inner end 43 of the muflier to a point adjacent the mufiler cylinder head 39 thus dividing the muffler cylinder radially intoa larger-cham ber 44 andsmaller chamber 45-connected by a passageway 46. The chamber 44 is preferably cylindrical in transverse section-and the plates 41 conform-in outline to the interior of the chamber, their edges approaching the chamber ,walllb'ut terminating at a distance therefrom so that an annular-passageway 47 around each plate isformed. Inaddition .5 ,c,-sslheat at the rotating passages 48 are cut in the various plates at points which do not register radially in successive plates. The exhaust pipe 36 connects with a port 49 opening into the .inner end of the mufiler chamber 44.

The gas mixing and intake chambers and valves are positioned in and adjacent the crank shaft member. For a portion of its length exterior to the engine crank case and within the bearing 13, the crank shaft 12 is hollowed, the inner end of the hollowed portion 50 connecting with the intake conduit 28 and the outer end opening into exterior ports 51 cut into a cap 52.

The chamber 45 extends radially toward the engine shaft and is then ofiset axially as at 81 terminatin in an annular U-shaped channel 82, opening outwardly and axially from the engine. The channel 82 registers with a similar U-shaped channel-83 fixed to the bearing-13, the edges of the channels being adjacent, the inner edges contacting and thelouter edges 83' being sufliciently separated to form a non-frictional joint thereby permitting passage of, gases therethrough. In the channel 83 the stationary exhaustport 84 is formed to which the exhaust pipe may be secured. t

The exhaust gases are cooled by conduction and radiation from transverse fins 87 formed integrally with the walls of the muflier cylinder. In addition the heatedgases expand into the mufller chambers 44 contacting with thepartition surfaces 41 releasing heat thereto which in turn is conducted to the mufller head and radiated.

In order to prevent largely the escape of gases from the mufiier into the atmosphere immediately about the engine through the open j ointbetween the rotary and stationary parts of the engine, utilization is made of the air pressure developed through the rotation of the engine unit in a drum shaped casing 88 which communicates, by means of a conduit 89 in the base, with the hollow standard 14. From the standard 14 an annular channel 90 leads around the exhaust channel 83 and the loose joint 83' between the registering channels 82 and 83, the inner edge91 of the channel 90 having a close but small frictional bearing on the channel member 82.

It is apparent that the air pressure developed in the engine casing is transmitted to the annular joint 83thus tending to pre-' vent egress-of exhaust gases at this point and thus making possible a noncontacting joint between the heated rotating member and non-rotating channel member 82 and 83.

heated exhaust gases about the intake chamber heats the same thereby permitting ready combustion of the intake gases.

Subsequent to explosion the exhaust gases pass into the mufiler wherein after successive expansion the gas is expelled through the annular channel 83 about the intake and out the exhaust port 84. t

It is evident that many modifications of the embodiment illustrated and described may be resorted to without departing from the spirit of the invention and I do not therefore desire'to limit myself 'to the s e cific embodiment shown and described, ut to interpret the invention broadly limited onl by the followin claims:

avingthus described my invention, what I claim-is:

1. A mufller for gas engines comprising in combination, a casing having external heat radiating fins; a partition separating the easing into two compartments; a removable head for said casing; a plurality of conically shaped bafile plates in one of said compartments, said removable head forming a support for said baflle plates; and a passa eway etween said compartments wherebdy t e exhaust gases flow in opposite irections through said compartments.

' 2. A mufiler for gas engines comprising in combination, a casing; a partition separatin the casing into two compartments; :1

plura ity of conically shaped baflie plates positioned in one of said compartments and having non-registering peripheral notches in said plates; a communlcating passageway between said compartments whereb the exhaust gases flow in opposite irections through said compartments. 3. In a muffler for use in rotary as engines, a relatively movable casing ormed with two compartments; a removable head for said chamber; a plurality of conically shaped bafile plates integrally formed in said head and extending into one of said compartments; a communicating passagewaybetween said compartments so arranged that exhaust gases flow in opposite directions through said compartments.

7 In testimony whereof, I aflix m signature. CARL P. BRO KWAY.

Further, the air pressure "developed forces 7 a some air through. the joint 83' which air being relatively cool and mixin with the exhaust gases, tends to diminis: the temperature of the same thereby preventing ex- 7 bearing 17. It should also be noted that the passage of the 

